Accession Number : ADA261214


Title :   Final Report on Contract N00014-91-J-1143 (University of California Irvine)


Corporate Author : CALIFORNIA UNIV IRVINE


Personal Author(s) : White, Steven R


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a261214.pdf


Report Date : Jan 1992


Pagination or Media Count : 6


Abstract : Over the last two years, we have used several different numerical techniques to study a variety of intrinsically correlated electron systems. The three main types of numerical techniques we have used are: (1) finite- temperature quantum Monte Carlo (QMC); (2) exact diagonalization; and (3) numerical renormalization groups. We have made substantial progress both on developing and improving the numerical algorithms and in using these methods to study interesting systems. We have developed techniques for analytically continuing imaginary-time QMC data to obtain dynamical properties, and have used these techniques to study pseudogap and gap formation in the repulsive and attractive Hubbard models. We have developed a program to calculate two particle interaction vertices with full frequency and momentum dependence using QMC, and have studied possible magnetic and superconducting instabilities in the Hubbard model.


Descriptors :   *ELECTRONS , *NUMERICAL METHODS AND PROCEDURES , ALGORITHMS , MAGNETIC PROPERTIES , INSTABILITY , SUPERCONDUCTIVITY , MOLECULE MOLECULE INTERACTIONS , COMPUTATIONS , MONTE CARLO METHOD


Subject Categories : Numerical Mathematics
      Nuclear Physics & Elementary Particle Physics


Distribution Statement : APPROVED FOR PUBLIC RELEASE